USEROS GUIDE 2534/2654
Warning!Charging Guide
" Always make sure you are in a safe place whenever you are reading the
After a full charge, timekeeping remains enabled for up to about nine months (Module
display of the watch using the auto light switch. Be especially careful when2534)/11 months (Module 2654), while the watch is used under the conditions
running or engaged in any other activity that can result in accident or injury.described below.
Also take care that sudden illumination by the auto light switch does not
surprise or distract others around you.Operating Conditions
" When you are wearing the watch, make sure that its auto light switch is turned"Watch is not exposed to light
off before riding on a bicycle or operating a motorcycle or any other motor"Display on 18 hours per day, sleep state 6 hours per day
vehicle. Sudden and unintended operation of the auto light switch can create a"1 backlight operation (1.5 seconds) per day
distraction, which can result in a traffic accident and serious personal injury."10 seconds of alarm operation per day
"1 countdown timer operation per day
To turn the auto light switch on and off
Charge Times
In the Timekeeping Mode, hold down D for about two seconds to toggle the auto light
switch on (AUTO EL displayed) and off (AUTO EL not displayed).Exposing the watch to light for the periods shown below each day restores the power
used by the above operating conditions.
" The auto light switch on indicator (AUTO EL) is on the display in all modes while the
auto light switch is turned on.Exposure Level (Brightness)Approximate Exposure Time
Outdoor Sunlight (50,000 lux)5 minutes
BatterySunlight Through a Window (10,000 lux)24 minutes
This watch is equipped with a solar cell and a rechargeable battery (secondaryDaylight Through a Window on a Cloudy Day48 minutes
battery) that is charged by the electrical power produced by the solar cell. The(5,000 lux)
illustration shown below shows how you should position the watch for charging.
Indoor Fluorescent Lighting (500 lux)8 hours
Example: Orient the watch so itsSolar cell" Stable operation is promoted by frequent charging.
face is pointing at a light source.
" Note that charging efficiency dropsRecovery Times
when any part of the solar cell isThe table below shows the amount exposure that is required to take the battery from
blocked by clothing, etc.one level to the next.
" The illustration shows how to position
a watch with a resin band.Exposure LevelApproximate Exposure Time
(Brightness)
Level 5 Level 4 Level 3 Level 2Level 1
Important!
" Storing the watch for long periods in an area where there is no light or wearing it in
such a way that it is blocked from exposure to light can cause rechargeable batteryOutdoor Sunlight65 minutes (Module 2534)18 hours (Module2534)4 hours
power to run down. Be sure that the watch is normally exposed to bright light (50,000 lux)1 hour (Module 2654)14 hours (Module 2654)
whenever possible.Sunlight Through a98 hours (Module 2534)
" This watch employs a solar cell that converts light into electricity, which charges aWindow(10,000 lux)4 hours19 hours
67 hours (Module 2654)
built-in rechargeable battery. Normally, the rechargeable battery should not need
replacement, but after very long use over a number of years, the rechargeableDaylight Through a Window7 hours (Module 2534)� � �
battery may lose its ability to achieve a full charge. Should you notice problems withon a Cloudy Day (5,000 lux)6 hours (Module 2654)
getting the rechargeable battery to a full charge, contact your dealer or CASIOIndoor Fluorescent Lighting
distributor about having the rechargeable battery replaced.(500 lux)60 hours� � �
" The rechargeable battery should be replaced with a CASIO-specified CTL1616
battery only. Other rechargeable batteries can cause damage to the watch." The above exposure time values are all for reference only. Actual required exposure
" All data stored in memory is deleted, and the current time and all other settingstimes depend on lighting conditions.
return to their initial factory defaults whenever battery power drops to Level 5 and
when you have the battery replaced.
" Turn on the watchOs Power Saving function and keep it in an area normally exposedReference
to bright light when storing it for long periods. This helps to keep the rechargeable
This section contains more detailed and technical information about watch operation.
battery from going dead.
It also contains important precautions and notes about the various features and
functions of this watch.
Battery Power Indicator
The battery power indicator on the display shows you the current status of the
rechargeable batteryOs power.Power Saving Function
When turned on, the Power Saving function automatically
Battery power indicatorLevelBattery PowerFunction Statusputs the watch into a sleep state whenever it is left in an
Indicatorarea where it is dark for 30 to 35 minutes. The sleep state
is indicated by a blank screen with SLEEP flashing on it.
1All functions enabled.In the sleep state, all functions are enabled, except for the
display.
2All functions enabled.
" Wearing watch inside the sleeve of clothing can cause it
3All functions enabled.to enter the sleep state.
4Beeper tone, backlight,
display, and buttons areTo recover from the sleep state
(Charge Soon Alert)disabled.Perform any one of the following operations.
" Move the watch to a well-lit area. It can take up to five seconds for the display to turn
5All functions, includingon.
timekeeping, are disabled." Press any button.
" Angle the watch towards your face for reading.
" The flashing indicator at Level 4 tells you that battery power is very low, and that
exposure to bright light for charging is required as soon as possible.To turn Power Saving on and off
" At Level 5, all functions are disabled and settings return to their initial factory1.In the Timekeeping Mode, hold down A until the
defaults. Functions are enabled once again after the rechargeable battery isseconds start to flash, which indicates the setting
charged, but you need to set the current time, date, and all other settings after thescreen.
battery is recharged to Level 3 from Level 5. Though the time appears on the display2.Press C seven times until the Power Saving on/off
after the battery is charged to Level 4, you will not be able to change the time settingscreen appears.
until the battery reaches Level 3.3.Press D to toggle Power Saving on (ON) and off
" Leaving the watch in direct sunlight or some other very strong light source can(OFF).
cause the battery power indicator to temporarily show a reading that is higher than4.Press A to exit the setting screen.
the actual battery level. The correct battery power indicator should appear after a" The Power Saving on indicator (SAVE) is on the display
few minutes.in all modes while the Power Saving is turned on.
" If you use the backlight or any of the alarm functions a number of times during a
short period, RECOVER appears on the display and the following operationsAuto Return Feature
become disabled until battery power recovers.If you leave a screen with flashing digits on the display for two or three minutes without
Backlightperforming any operation, the watch automatically saves any settings you have made
Beeper toneup to that point and exits the setting screen.
After some time, battery power will recover and RECOVER will disappear, indicating
that the above functions are enabled again.Initial Screens
When you enter the Telememo, World Time, or Alarm Mode, the data you were
Charging Precautionsviewing when you last exited the mode appears first.
Certain charging conditions can cause the watch to become very hot. Avoid leaving
the watch in the areas described below whenever charging its rechargeable battery.Data and Setting Scrolling
Also note that allowing the watch to become very hot can cause its liquid crystal
display to black out. The appearance of the LCD should become normal again whenThe B and D buttons are used in various modes and setting screens to scroll
through data on the display. In most cases, holding down these buttons during a scroll
the watch returns to a lower temperature.operation scrolls through the data at high speed.
Warning!
Leaving the watch in bright light to charge its rechargeable battery can cause it
to become quite hot. Take care when handling the watch to avoid burn injury.
The watch can become particularly hot when exposed to the following
conditions for long periods.
" On the dashboard of a car parked in direct sunlight
" Too close to an incandescent lamp
" Under direct sunlight
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ACEC
